"""按共同基线组合独立修改；不推测冲突，不丢掉空白和样式。"""

import pytest

from muse.正式变更.接口 import 变更错误
from muse.正文写作.接口 import 三方合并, 文本节点, 正文草稿, 段落, 段落差异


def 稿(first="开头", last="结尾"):
    return 正文草稿(
        (
            段落("p1", (文本节点(first, ("emphasis",)),)),
            段落("p2", ()),
            段落("p3", (文本节点(last),)),
        )
    )


@pytest.mark.case_id(
    "NC-w23-233001",
    environment="默认离线",
    given="有确切共同基线的正文分支",
    when="选择差异、修改两端或按同命令重放",
    then=["部分选择只合并该项且目标独立修改保持"],
    contract="docs/系统架构/新版设计/模块设计/B05-正文写作.md",
)
def test_部分选择只合并该项且目标独立修改保持__233001():
    base = 稿()
    source = 稿("支线开头", "未选择的支线结尾")
    target = 稿(last="作者主线结尾")
    choices = 段落差异(base, source)
    result = 三方合并(base, source, target, (choices[0]["change_id"],))
    assert result == 稿("支线开头", "作者主线结尾")
    assert result.paragraphs[1] == base.paragraphs[1]


@pytest.mark.case_id(
    "NC-w23-233002",
    environment="默认离线",
    given="有确切共同基线的正文分支",
    when="选择差异、修改两端或按同命令重放",
    then=["目标插入导致位移仍精确合并原段"],
    contract="docs/系统架构/新版设计/模块设计/B05-正文写作.md",
)
def test_目标插入导致位移仍精确合并原段__233002():
    base, source = 稿(), 稿(last="支线结尾")
    extra = 段落("extra", (文本节点("作者加的前言🙂e\u0301"),))
    target = 正文草稿((extra, *base.paragraphs))
    result = 三方合并(base, source, target, (段落差异(base, source)[0]["change_id"],))
    assert result == 正文草稿((extra, *source.paragraphs))
    assert base == 稿()


@pytest.mark.case_id(
    "NC-w23-233003",
    environment="默认离线",
    given="有确切共同基线的正文分支",
    when="选择差异、修改两端或按同命令重放",
    then=["重叠修改或同位插入冲突不替作者决策"],
    contract="docs/系统架构/新版设计/模块设计/B05-正文写作.md",
)
@pytest.mark.parametrize("insert", [False, True])
def test_重叠修改或同位插入冲突不替作者决策__233003(insert):
    base, source, target = 稿(), 稿("支线开头"), 稿("主线开头")
    if insert:
        source = 正文草稿(
            (base.paragraphs[0], 段落("s", (文本节点("支线插入"),)), *base.paragraphs[1:])
        )
        target = 正文草稿(
            (base.paragraphs[0], 段落("t", (文本节点("主线插入"),)), *base.paragraphs[1:])
        )
    with pytest.raises(变更错误, match="冲突"):
        三方合并(base, source, target, (段落差异(base, source)[0]["change_id"],))


@pytest.mark.case_id(
    "NC-w23-233004",
    environment="默认离线",
    given="有确切共同基线的正文分支",
    when="选择差异、修改两端或按同命令重放",
    then=["相同修改仅保留一次且未知差异拒绝"],
    contract="docs/系统架构/新版设计/模块设计/B05-正文写作.md",
)
def test_相同修改仅保留一次且未知差异拒绝__233004():
    base, edited = 稿(), 稿("两边相同")
    assert 三方合并(base, edited, edited, (段落差异(base, edited)[0]["change_id"],)) == edited
    with pytest.raises(变更错误):
        三方合并(base, edited, base, ("not-a-change",))